1 //===-- Unittests for syscalls --------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "src/unistd/syscall.h"
10 #include "test/UnitTest/ErrnoCheckingTest.h"
11 #include "test/UnitTest/ErrnoSetterMatcher.h"
12 #include "test/UnitTest/Test.h"
13
14 #include "hdr/fcntl_macros.h"
15 #include <sys/stat.h> // For S_* flags.
16 #include <sys/syscall.h> // For syscall numbers.
17 #include <unistd.h>
18
19 using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
20 using LlvmLibcSyscallTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
21
22 // We only do a smoke test here. Actual functionality tests are
23 // done by the unit tests of the syscall wrappers like mmap.
24 // The goal is to test syscalls with a wide number of args.
25
26 // There is no function named "syscall" in llvm-libc, we instead use a macro to
27 // set up the arguments properly. We still need to specify the namespace though
28 // because the macro generates a call to the actual internal function
29 // (__llvm_libc_syscall) which is inside the namespace.
TEST_F(LlvmLibcSyscallTest,TrivialCall)30 TEST_F(LlvmLibcSyscallTest, TrivialCall) {
31 ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_gettid), 0l);
32 ASSERT_ERRNO_SUCCESS();
33 }
34
TEST_F(LlvmLibcSyscallTest,SymlinkCreateDestroy)35 TEST_F(LlvmLibcSyscallTest, SymlinkCreateDestroy) {
36 constexpr const char LINK_VAL[] = "syscall_readlink_test_value";
37 constexpr const char LINK[] = "testdata/syscall_readlink.test.link";
38
39 #ifdef SYS_symlink
40 ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_symlink, LINK_VAL, LINK), 0l);
41 #elif defined(SYS_symlinkat)
42 ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_symlinkat, LINK_VAL, AT_FDCWD, LINK),
43 0l);
44 #else
45 #error "symlink and symlinkat syscalls not available."
46 #endif
47 ASSERT_ERRNO_SUCCESS();
48
49 char buf[sizeof(LINK_VAL)];
50
51 #ifdef SYS_readlink
52 ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_readlink, LINK, buf, sizeof(buf)), 0l);
53 #elif defined(SYS_readlinkat)
54 ASSERT_GE(
55 LIBC_NAMESPACE::syscall(SYS_readlinkat, AT_FDCWD, LINK, buf, sizeof(buf)),
56 0l);
57 #endif
58 ASSERT_ERRNO_SUCCESS();
59
60 #ifdef SYS_unlink
61 ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_unlink, LINK), 0l);
62 #elif defined(SYS_unlinkat)
63 ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_unlinkat, AT_FDCWD, LINK, 0), 0l);
64 #else
65 #error "unlink and unlinkat syscalls not available."
66 #endif
67 ASSERT_ERRNO_SUCCESS();
68 }
69
TEST_F(LlvmLibcSyscallTest,FileReadWrite)70 TEST_F(LlvmLibcSyscallTest, FileReadWrite) {
71 constexpr const char HELLO[] = "hello";
72 constexpr int HELLO_SIZE = sizeof(HELLO);
73
74 constexpr const char *TEST_FILE = "testdata/syscall_pread_pwrite.test";
75
76 #ifdef SYS_open
77 long fd =
78 LIBC_NAMESPACE::syscall(SYS_open, TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU);
79 #elif defined(SYS_openat)
80 long fd = LIBC_NAMESPACE::syscall(SYS_openat, AT_FDCWD, TEST_FILE,
81 O_WRONLY | O_CREAT, S_IRWXU);
82 #else
83 #error "open and openat syscalls not available."
84 #endif
85 ASSERT_GT(fd, 0l);
86 ASSERT_ERRNO_SUCCESS();
87
88 ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_pwrite64, fd, HELLO, HELLO_SIZE, 0),
89 0l);
90 ASSERT_ERRNO_SUCCESS();
91
92 ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_fsync, fd), 0l);
93 ASSERT_ERRNO_SUCCESS();
94
95 ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_close, fd), 0l);
96 ASSERT_ERRNO_SUCCESS();
97 }
98
TEST_F(LlvmLibcSyscallTest,FileLinkCreateDestroy)99 TEST_F(LlvmLibcSyscallTest, FileLinkCreateDestroy) {
100 constexpr const char *TEST_DIR = "testdata";
101 constexpr const char *TEST_FILE = "syscall_linkat.test";
102 constexpr const char *TEST_FILE_PATH = "testdata/syscall_linkat.test";
103 constexpr const char *TEST_FILE_LINK = "syscall_linkat.test.link";
104 constexpr const char *TEST_FILE_LINK_PATH =
105 "testdata/syscall_linkat.test.link";
106
107 // The test strategy is as follows:
108 // 1. Create a normal file
109 // 2. Create a link to that file.
110 // 3. Open the link to check that the link was created.
111 // 4. Cleanup the file and its link.
112
113 #ifdef SYS_open
114 long write_fd = LIBC_NAMESPACE::syscall(SYS_open, TEST_FILE_PATH,
115 O_WRONLY | O_CREAT, S_IRWXU);
116 #elif defined(SYS_openat)
117 long write_fd = LIBC_NAMESPACE::syscall(SYS_openat, AT_FDCWD, TEST_FILE_PATH,
118 O_WRONLY | O_CREAT, S_IRWXU);
119 #else
120 #error "open and openat syscalls not available."
121 #endif
122 ASSERT_GT(write_fd, 0l);
123 ASSERT_ERRNO_SUCCESS();
124
125 ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_close, write_fd), 0l);
126 ASSERT_ERRNO_SUCCESS();
127
128 #ifdef SYS_open
129 long dir_fd = LIBC_NAMESPACE::syscall(SYS_open, TEST_DIR, O_DIRECTORY, 0);
130 #elif defined(SYS_openat)
131 long dir_fd =
132 LIBC_NAMESPACE::syscall(SYS_openat, AT_FDCWD, TEST_DIR, O_DIRECTORY, 0);
133 #else
134 #error "open and openat syscalls not available."
135 #endif
136 ASSERT_GT(dir_fd, 0l);
137 ASSERT_ERRNO_SUCCESS();
138
139 ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_linkat, dir_fd, TEST_FILE, dir_fd,
140 TEST_FILE_LINK, 0),
141 0l);
142 ASSERT_ERRNO_SUCCESS();
143 #ifdef SYS_open
144 long link_fd =
145 LIBC_NAMESPACE::syscall(SYS_open, TEST_FILE_LINK_PATH, O_PATH, 0);
146 #elif defined(SYS_openat)
147 long link_fd = LIBC_NAMESPACE::syscall(SYS_openat, AT_FDCWD,
148 TEST_FILE_LINK_PATH, O_PATH, 0);
149 #else
150 #error "open and openat syscalls not available."
151 #endif
152 ASSERT_GT(link_fd, 0l);
153 ASSERT_ERRNO_SUCCESS();
154
155 #ifdef SYS_unlink
156 ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_unlink, TEST_FILE_PATH), 0l);
157 #elif defined(SYS_unlinkat)
158 ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_unlinkat, AT_FDCWD, TEST_FILE_PATH, 0),
159 0l);
160 #else
161 #error "unlink and unlinkat syscalls not available."
162 #endif
163 ASSERT_ERRNO_SUCCESS();
164
165 #ifdef SYS_unlink
166 ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_unlink, TEST_FILE_LINK_PATH), 0l);
167 #elif defined(SYS_unlinkat)
168 ASSERT_GE(
169 LIBC_NAMESPACE::syscall(SYS_unlinkat, AT_FDCWD, TEST_FILE_LINK_PATH, 0),
170 0l);
171 #else
172 #error "unlink and unlinkat syscalls not available."
173 #endif
174 ASSERT_ERRNO_SUCCESS();
175
176 ASSERT_GE(LIBC_NAMESPACE::syscall(SYS_close, dir_fd), 0l);
177 ASSERT_ERRNO_SUCCESS();
178 }
179